<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">

<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>

<body>

<form action="login" method="post">
    账号<input type="text" name="username"><br>
    密码<input type="text" name="password" id="password"><br>
    <input type="submit" value="登录" id="loginBut">
</form>
<span th:text="${msg}" style="color: red"></span>
</body>

</html>